London bus explodes in film stunt, but not everyone's impressed

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A screen grab of a video tweeted by a local London fire service, @FireLambeth, of a stunt bus blast.

Story highlights

A stunt bus explosion on a bridge over London's River Thames sparked some panic

The stunt was apparently for the new Jackie Chan movie called "The Foreigner"

London (CNN)It wasn't quite the lazy Sunday afternoon everyone in central London was expecting.

An iconic red double decker bus slowly moved across the River Thames over Lambeth Bridge before it dramatically exploded into a plume of flames.

But tourists and bystanders need not have panicked -- it was apparently in the name of a new Jackie Chan movie called "The Foreigner." Local politician Nigel Huddleston reassured his Twitter followers.